56 BOTANICAL GAZETTE [JANUARY 
forester to form an opinion as to the requirements of the species and its 
capacity for development under different conditions. Tables of statistics 
showing the progress of exploitation of the forest resource, together with 
estimates of standing timber in each locality, enable the student of political 
economy to form an estimate as to the condition and promise of that resource. 
A peculiarity of the southern pines is that, although they occur over large 
areas in pure stands, they do not exhibit the heavy yield per acre so common 
to the northern pineries. The illustrations of Long-leaf and Cuban pine for- 
ests remind one of the open park like character of the forests of the Rocky 
mountain region more than of the northern pineries. It would appear that 
the most productive areas, as well as the largest uncut territory of Long- 
leaf pine, is to be found in Louisiana and Texas, where over 700,000 acres, 
cutting 6000 feet in the average, are said to exist. The most productive 
Short-leaf and Loblolly pine areas are also to be found west of the Missis- 
sippi, north of the Long-leaf pine area. 
An interesting botanical point is made in an addendum to the eae -leaf 
monograph, in which Dr. Mohr describes a considerable body of commercial 
timber of this species in the mountains of Clay county, Alabama, at an eleva- 
tion of little less than 2000 feet. The most elevated point at which the 
species had been previously known to exist was 1500 feet. 
The botanical descriptions, with developmental features added, are clear 
and complete, and are accompanied bya series of illustrations which for 
the most part are excellent examples of the wood engravers’ art. They 
are full of natural sized drawings from nature, with enlargements of single 
parts. If we should find fault with these plates, thoroughly satisfactory to the 
student, it would be from the artistic point of view, on account of the inartistic 
curtailment of the long needles which would not go on the plate, although 
we are at a loss to suggest how to obviate this trouble and yet preserve the 
natural size on a 7 X 9 page. 
Especial attention has been given to a description of the development of 
the tree through various stages of its life, and its dependence on surrounding 
conditions, and this isillustrated by a series of measurements of the rate of 
growth during = periods of henanaiey This feature i is probably one of 
ona ones impor ot nber anid forester, as it enables him to base 
fit calculati ding his f é ik kbs oie 
est to the botanist to know the laws of ihe the species follows 
through its lifetime. ‘The tables of measurement are accompanied <a Bio 
_ erly devised graphic illustr whicl y show the varying de 
_ during each period of ten years. 
‘a 
The cotecinding: piri ask deol Ge to the tat nk the structure of the 
wood of the five pines by Mr. Filibert Roth. — eam ammaeritd tna compen a 
Laie ens reeac asc men f wood tructure, 
